Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b5635b44dee84b…

MALICIOUS

PDF

41.7 KB Authoring application: LibreOffice
MD5: d8437c274f98b7341001e10e7698bfc0 SHA-1: 1ffc005e90219a549144272fce52ae139cf20b36 SHA-256: a7b5635b44dee84b174dd768e755a45d2e6d3d316de8d17cd4f47285f48791da
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, suggests a lure related to printing labels. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://myzticisle.net/uploads/1/3/0/7/130775778/7652053.pdf
    • http://trails4tailsfest.org/uploads/1/3/0/5/130544826/fexuvejiwubufebub.pdf
    • http://surggripper.com/uploads/1/3/0/6/130604044/pevajujavubipu-bowowobipituvo-jibawipigilige.pdf
    • http://blacksmithspdf.com/uploads/1/3/0/5/130542755/130542755.html#printing+staples+labels+template

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000105b.bin
a05e2a2f11dac807c66e10e61f52f3623f6f7ec5d5eed40721db2704185241e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B 9108 bytes
font_01_sfnt_off000059bb.bin
baaf88e785fea15f4c87435e5f56f0c158d4e7ad61bef8d11588c28ed386abcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59BB 17064 bytes

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